Can you tell if a phone call has been redirected from another number on a voice gateway? Actually, yes, you can. When a call comes into the voice gateway, there is one place you can see this information. Below, you can see that someone called 2054441307 has a callfwdall to 2227540. I have times when I need to know this, so its good to know where to find the info should you need it.
002727: *Jul 24 19:25:10.226: ISDN Se0/0/1:23 Q931: RX <- SETUP pd = 8 callref = 0x347E
Bearer Capability i = 0x8090A2
Standard = CCITT
Transfer Capability = Speech
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA98383
Exclusive, Channel 3
Facility i = 0x9F8B0100A117020148020100800F4A4343454F20202020202020202020
Protocol Profile = Networking Extensions
0xA117020148020100800F4A4343454F20202020202020202020
Component = Invoke component
Invoke Id = 72
Operation = CallingName
Name Presentation Allowed Extended
Name = CompanyName
Display i = 'CompanyName '
Calling Party Number i = 0x2180, '2055558513'
Plan:ISDN, Type:National
Called Party Number i = 0xC1, '2227540'
Plan:ISDN, Type:Subscriber(local)
Redirecting Number i = 0x00008F, '2054441307'
Plan:Unknown, Type:Unknown
002728: *Jul 24 19:25:10.406: ISDN Se0/0/1:23 Q931: TX -> CALL_PROC pd = 8 callref = 0xB47E
Channel ID i = 0xA98383
Exclusive, Channel 3
002729: *Jul 24 19:25:10.406: ISDN Se0/0/1:23 Q931: TX -> ALERTING pd = 8 ca
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